Product Subtitle / Keywords:
2.83 Inch Display, 480(RGB)×640 Resolution, Transmissive a-Si TFT IPS, 18BIT RGB / MIPI Interface, COG+FPC+B/L, 16.7M Colors, 40-Pin, ST7701SN Driver, 50×69.2×2.18 mm, 1200:1 Contrast Ratio, 35ms Response Time, Free (IPS) Viewing Direction, -20°C~70°C Operating Temperature

1. Executive Summary & Product Positioning

The LS0283I03-MPR-V1, developed by Lixin (Wan'an) Intelligent Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 2.83-inch transmissive amorphous Silicon TFT-LCD (a-Si TFT-LCD) module with IPS (In-Plane Switching) technology.

This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (COG+FPC+B/L), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete 18BIT RGB and MIPI interface pinout and timing, and comprehensive electro-optical performance. It delivers a resolution of 480(RGB)×640 with 16.7M-color display capability, driven by the ST7701SN controller.

The document provides the core parameters necessary for system integration into compact embedded display applications. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, interface timing, and mechanical tolerances described herein to ensure reliable performance and compatibility.

2. Detailed Product Overview & Architecture

• Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
• Display Mode: Active matrix TFT, Transmissive type.
• Display Format: Graphic 480(RGB)×640 Dot-matrix.
• Display Characteristics: Capable of displaying up to 16.7 million colors.
• Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit). Composed of a TFT-LCD panel, a driver circuit, and a backlight unit.
• Input Data: 18BIT RGB / MIPI.
• Viewing Direction (Grayscale Inversion): Free (IPS) – wide viewing angle in all directions.
• Drive IC: ST7701SN.
• Connector Pin Count: 40-Pin.
• Approval Status: ☑ Approved Product Specification only (as per signature block).

3. Exhaustive Technical Specifications

3.1 Mechanical & Physical Specifications

Critical Mechanical Design Notes (from outline dimension drawing):

1. Display Type: Main LCD: Transmissive, IPS.
2. Viewing Direction: ALL.
3. Operating Temperature: -20°C ~ 70°C.
4. Storage Temperature: -30°C ~ 80°C.
5. Main LCD Driver: ST7701SN.
6. Backlight: 6 Chip-White LED Parallel.
7. ROHS Compliance: Yes.
8. General Tolerance: ±0.20 mm.
9. Angular Tolerance: ∠ ±1/4°.
10. Enclosure Design Notes:
    • It is recommended that the housing visible area be 0.3mm smaller per side than the VAmds.
    • The housing foam window should be 0.6mm larger per side than the VAmds.
    • The TP edge cannot contact metal conductors.
11. FPC Total Thickness: PI补强+FPC总厚=0.3mm.
12. Backlight Thickness: BL 2.18±0.05mm.
13. Polarizer Thickness: POL 0.13mm.
14. Silver Paste Points: Present on the module.
15. Yellow Insulation Paper: Included for handling during assembly.
16. Backlight Circuit: IF=180mA, Vf=3V~3.2V.

3.2 Electrical & Interface Specifications

3.2.1 Absolute Maximum Ratings

Notes (interpreted):

• Note1/Note2: Stress beyond these ratings may cause permanent damage; functional operation is not implied under these conditions.

3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)

3.2.3 Pin Description (40-pin FPC)

The module supports two interface modes: MIPI and RGB. The pin assignments differ between the two modes.

A. MIPI Interface Mode:

B. RGB Interface Mode (from drawing notes):

Interface Summary:

• Dual Interface Support: The module supports two interface modes:
  • MIPI: Uses 2 data lanes (DSI-D0, DSI-D1) and 1 clock lane (DSI-CLK) for high-speed serial data transmission.
  • 18BIT RGB: Uses VS, HS, DCLK, DE for timing control, and R0-R4, G0-G5, B0-B4 (18-bit data bus) for pixel data.
• Backlight: Dedicated LEDA (Anode, Pin 1) and LEDK (Cathode, Pin 2) pins.
• Power: VCC (Pin 3) for main logic, IOVCC (Pins 38, 40) for I/O interface, GND (Pins 4, 7, 10, 13-33, 39) for ground.
• Control: RESET (Pin 34), CS (Pin 35), SCL (Pin 36), SDA (Pin 37) for SPI register configuration.

3.2.4 Interface Timing Characteristics

A. Serial Interface Characteristics (3-line serial):

Conditions: VDDI=1.8, VDD=2.8, AGND=DGND=0V, Ta=25°C.

B. RGB Interface Characteristics:

Conditions: VDDI=1.8, VDD=2.8, AGND=DGND=0V=0V, Ta=25°C.

C. MIPI Interface Characteristics (High Speed Mode):

Conditions: VDDI=1.8, VDD=2.8, AGND=DGND=0V, Ta=25°C.

D. MIPI Interface Characteristics (Low Power Mode):

Conditions: VDDI=1.8, VDD=2.8, AGND=DGND=0V, Ta=25°C.

E. Reset Timing:

Reset Timing Notes (from document):

1. The reset cancel includes also required time for loading ID bytes, VCOM setting and other settings from NVM to registers. This loading is done every time when there is HW reset cancel time (tRT) within 5 ms after a rising edge of RESX.
2. Spike due to an electrostatic discharge on RESX line does not cause irregular system reset. A pulse shorter than 5µs is rejected, a pulse longer than 9µs initiates a reset.
3. During the Resetting period, the display will be blanked (maximum 120ms when Reset Starts in Sleep Out mode).

3.2.5 Backlight Unit

| 3.2.5 Backlight Unit

Backlight Circuit Diagram (from document):

LEDA → [Backlight Circuit] → LEDK
IF = 180mA
VF = 3V~3.2V

3.3 Optical & Electro-Optical Characteristics (Ta=25°C)

Notes (from document):

Note 1: Definition of Response Time
The electro-optical response time measurements shall be made by switching the “data” input signal ON and OFF. The times needed for the luminance to change from 10% to 90% is Tr and 90% to 10% is Td.

Note 2: Definition of Contrast Ratio
Contrast ratio (CR) is defined mathematically by the following formula:
Contrast Ratio = Luminance when displaying a white raster / Luminance when displaying a black raster

Note 3: Definition of Viewing Angle
Viewing angle is the angle at which the contrast ratio is greater than 10. Angles are determined for the horizontal or 3, 9 o'clock direction and the vertical or 6, 12 o'clock direction with respect to the optical axis which is normal to the LCD surface.

3.4 Inspection Standards

The document includes detailed inspection standards according to GB/T 2828-2003; normal inspection, Class II.

A. AQL (Acceptable Quality Level):

• Major Defect: 0.65
• Minor Defect: 1.5

B. Inspection Conditions:

• The LCM face to us, in normal environment, about an angle of incidence 30°, a distance of 30cm with normal eye, with an angle of 45 degree to check the products without uncovering the film.

C. Major Defect Criteria (Reject):

• No display, Missing line, Seg-com light and dark, No display in immobility, Flicker of Pattern, Mura, Over current, Voltage out of specification, Pattern blur/error code, Dark light/Flicker.

D. Minor Defect Criteria (Glass, FPC, Polarizer, etc.):

• Detailed criteria for glass cracks, glass extrusion, pin-side damage, FPC/H/S black tape shift, silicon and tuffy glue defects, and polarizer scratches/fibers.

3.5 Version Record

4. Application Guidelines & Critical Notes

Intended Use

• Smartwatches, fitness trackers, and other wearable devices
• IoT display nodes and smart home controls
• Miniature handheld instruments
• Any application requiring a compact, high-resolution display with excellent IPS viewing angles and dual interface options

Critical Design Considerations

1. Dual Interface Support (18BIT RGB / MIPI):

   • This module supports two interface modes: 18BIT RGB and MIPI.
   • RGB Mode: Uses 18 data lines (R0-R4, G5, G0-G5, B0-B4) for pixel data, plus VS, HS, DCLK, DE for timing control. SPI pins (CS, SCL, SDA) are used for register configuration.
   • MIPI Mode: Uses 2 data lanes (DSI-D0, DSI-D1) and 1 clock lane (DSI-CLK) for high-speed serial data transmission.
   • The host MCU must support the selected interface mode.

2. Power Supply:

   • Provide stable VCC (2.5V to 3.6V, 2.8V typical) for the main logic (connected to Pin 3).
   • Provide stable IOVCC (1.65V to 3.3V, 1.8V typical) for the I/O interface (connected to Pins 38, 40).
   • The backlight requires a constant-current LED driver connected to LEDA (Anode, Pin 1) and LEDK (Cathode, Pin 2), set to 180 mA at approximately 3V~3.2V.

3. Interface Selection:

   • The module supports both 18BIT RGB and MIPI interfaces. The pin assignments differ between the two modes.
   • For RGB mode: Use the pinout from the "RGB Interface Mode" table.
   • For MIPI mode: Use the pinout from the "MIPI Interface Mode" table.
   • Ensure the correct interface mode is selected and configured in the system design.

4. Mechanical Integration:

   • Module Outline: 50mm (H) × 69.2mm (V) × 2.18mm (D).
   • Active Area: 43.2mm × 57.6mm.
   • FPC: The module uses a 40-pin FPC.
   • Enclosure Design: The document provides specific recommendations for enclosure window openings relative to the LCD AA (Active Area):
     • Housing visible area: 0.3mm smaller per side than VAmds.
     • Housing foam window: 0.6mm larger per side than VAmds.
     • TP edge cannot contact metal conductors.

5. Viewing Angle Characteristics:
   This is an IPS panel with excellent viewing angle performance (CR > 10):

   • Top (12 o'clock): 85° (Typ)
   • Bottom (6 o'clock): 85° (Typ)
   • Left (9 o'clock): 85° (Typ)
   • Right (3 o'clock): 85° (Typ)

   The module provides near-perfect viewing angles in all directions, making it ideal for wearable devices.

6. Optical Performance:

   • Response Time: 35ms (Typ) – fast enough for most GUI applications.
   • Contrast Ratio: 1000 (Min), 1200 (Typ) – excellent contrast performance for an IPS panel.
   • Transmittance: 4.3% (Min), 5.0% (Typ).
   • White Chromaticity (CIE1931): Wx = TBD, Wy = TBD (Typical).

7. Temperature Limits:

   • Operating Temperature: -20°C to +70°C.
   • Storage Temperature: -30°C to +80°C.

Handling & Compliance

• The module is ROHS compliant.
• Observe standard ESD precautions during handling and assembly.
• The module contains fragile glass and a 40-pin FPC – handle with care.
• Avoid bending the FPC sharply, especially near the connector interface.
• The module has a total thickness of 2.18mm – be careful when handling to avoid flexing.
• The module includes a yellow insulation paper for handling during assembly.

5. Conclusion & Design-In Support

The LS0283I03-MPR-V1 specification details a high-performance 2.83-inch IPS display module with dual 18BIT RGB / MIPI interface and ST7701SN driver — an excellent choice for wearable and compact display applications requiring high resolution, excellent image quality, and interface flexibility.

Key Strengths:

1. Dual Interface Support: The module supports both 18BIT RGB and MIPI interfaces, providing flexibility for different system architectures.

2. High Resolution: The 480×640 resolution in a 2.83-inch format provides excellent pixel density for sharp text and graphics.

3. Excellent IPS Technology: 85° viewing angles in all directions ensure consistent image quality from any perspective — essential for wearable devices.

4. Excellent Contrast Ratio: 1200:1 (Typ) provides outstanding image quality for an IPS panel.

5. High Color Depth: 16.7M colors (24-bit true color) provides excellent color reproduction.

6. Standard 40-pin FPC: The 40-pin FPC provides a robust connection interface.

7. Wide Operating Temperature Range: -20°C to +70°C for operation and -30°C to +80°C for storage.

Main Design Focus:

• The critical design task is selecting and properly implementing the correct interface mode (18BIT RGB or MIPI) based on the host system's capabilities.
• Supporting requirements:
  • Provide stable VCC (2.8V typical) and IOVCC (1.8V typical) power.
  • Provide a constant-current backlight driver set to 180 mA at 3V~3.2V.
  • Mechanical integration — the module outline is 50mm × 69.2mm × 2.18mm.
  • FPC connector — verify the 40-pin FPC.
  • Interface selection — ensure the correct pinout is used based on the selected interface mode.

This module is an excellent choice for high-end wearable devices, smartwatches, and any compact IoT application requiring a high-resolution IPS display with flexible interface options and excellent image quality.